In the quark-meson diquark model, dense two-flavor QCD matter has four phases, and its speed of sound peaks before approaching the conformal limit from above, with charge neutrality softening the equation of state.
(45) Here the fermionic quasiparticle spectrum is E± ρ0 = q (E ± 1 2 µI )2 + g2 0ρ2 0 , (46) with E = p p2 + g2 0ϕ2
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Pion condensation versus 2SC, speed of sound, and charge neutrality effects in the quark-meson diquark model
In the quark-meson diquark model, dense two-flavor QCD matter has four phases, and its speed of sound peaks before approaching the conformal limit from above, with charge neutrality softening the equation of state.